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Neoarchean structural evolution of the Murchison Domain (Yilgarn Craton)
Precambrian Research ( IF 3.8 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.precamres.2020.105719 Ivan Zibra
Precambrian Research ( IF 3.8 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.precamres.2020.105719 Ivan Zibra
Abstract The progressive strengthening of the continental lithosphere triggered a secular transition in tectonic style during Neoarchean times, allowing the progressive establishment of Plate Tectonics on our planet. Structural investigations in Neoarchean cratons offer therefore a critical tool to constrain how such transition took place. The highly-mineralized Yilgarn Craton of Western Australia exposes one of the largest and best preserved portions of Archean continental crust worldwide. The Yilgarn crust was intensely deformed during the c. 2730–2650 Ma Neoarchean Yilgarn Orogeny, which was accompanied by widespread granitic magmatism, and was mostly unaffected by post-Archean pervasive tectonic events, representing therefore an ideal area for the study of Neoarchean tectono-magmatic events. Here, I combine new structural data with a re-examination of the recent regional structural literature, to offer an updated view of the structural evolution of the Murchison Domain, one of the best-exposed and mineralized portions of the Yilgarn Craton. The result is a new fourfold scheme for the structural evolution of the domain, supported by a detailed and structurally-controlled geochronological dataset. The preserved tectono-magmatic evolution of the domain started with a pre-orogenic period of dominant polydiapirism, during times of prevailing tectonic quiescence. This was followed by a sequence of orogenic deformation events that produced north-striking large-scale shear zones, along which syntectonic plutons, up to 100 km in size, were emplaced during three major tectonic pulses characterized by bulk east–west shortening, between 2730 and 2660 Ma. The deformation events identified here at the scale of the Murchison Domain are likely the local expression of Yilgarn-wide tectono-magmatic events, highlighting the importance of syntectonic granitic magmatism in shaping Neoarchean orogens.
中文翻译:
默奇森域(Yilgarn Craton)的新太古代构造演化
摘要 大陆岩石圈的逐渐加强引发了新太古代时期构造样式的长期转变,从而使我们星球上的板块构造逐渐建立。因此,对新太古代克拉通的结构研究提供了一个重要的工具来限制这种转变是如何发生的。西澳大利亚高度矿化的伊尔加恩克拉通 (Yilgarn Craton) 暴露了世界上最大、保存最完好的太古代大陆地壳部分之一。Yilgarn 地壳在 c 期间剧烈变形。2730-2650 Ma 新太古代伊尔加恩造山运动,伴随广泛的花岗岩岩浆作用,几乎不受后太古代普遍构造事件的影响,是研究新太古代构造岩浆事件的理想区域。这里,我将新的构造数据与最近的区域构造文献的重新检查相结合,以提供有关默奇森域构造演化的最新观点,默奇森域是伊尔加恩克拉通最暴露和矿化的部分之一。结果是该域结构演化的新四重方案,由详细且结构控制的地质年代数据集支持。该区域保存完好的构造岩浆演化始于造山前占主导地位的多底辟时期,在当时的构造静止时期。紧随其后的是一系列造山带变形事件,产生了向北冲击的大规模剪切带,在三个主要的构造脉冲期间,沿着这些带的同构造岩体被放置,高达 100 公里的大小,以大块东西向缩短为特征,在 2730 到 2660 Ma 之间。这里在默奇森域尺度上确定的变形事件可能是伊尔加恩范围内构造岩浆事件的局部表现,突出了同构造花岗质岩浆作用在塑造新太古代造山带中的重要性。
更新日期:2020-07-01
中文翻译:
默奇森域(Yilgarn Craton)的新太古代构造演化
摘要 大陆岩石圈的逐渐加强引发了新太古代时期构造样式的长期转变,从而使我们星球上的板块构造逐渐建立。因此,对新太古代克拉通的结构研究提供了一个重要的工具来限制这种转变是如何发生的。西澳大利亚高度矿化的伊尔加恩克拉通 (Yilgarn Craton) 暴露了世界上最大、保存最完好的太古代大陆地壳部分之一。Yilgarn 地壳在 c 期间剧烈变形。2730-2650 Ma 新太古代伊尔加恩造山运动,伴随广泛的花岗岩岩浆作用,几乎不受后太古代普遍构造事件的影响,是研究新太古代构造岩浆事件的理想区域。这里,我将新的构造数据与最近的区域构造文献的重新检查相结合,以提供有关默奇森域构造演化的最新观点,默奇森域是伊尔加恩克拉通最暴露和矿化的部分之一。结果是该域结构演化的新四重方案,由详细且结构控制的地质年代数据集支持。该区域保存完好的构造岩浆演化始于造山前占主导地位的多底辟时期,在当时的构造静止时期。紧随其后的是一系列造山带变形事件,产生了向北冲击的大规模剪切带,在三个主要的构造脉冲期间,沿着这些带的同构造岩体被放置,高达 100 公里的大小,以大块东西向缩短为特征,在 2730 到 2660 Ma 之间。这里在默奇森域尺度上确定的变形事件可能是伊尔加恩范围内构造岩浆事件的局部表现,突出了同构造花岗质岩浆作用在塑造新太古代造山带中的重要性。